Stock Option and Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2018

Stock Option and Incentive Plan and Stock Purchase Plan [Abstract]

Share-based Compensation, Stock Options, Activity [Table Text Block]

A summary of the status of Boston Properties, Inc.’s stock options as of December 31, 2019, 2018 and 2017 and changes during the years then ended are presented below:

	Shares		Weighted-Average Exercise Price
Outstanding at December 31, 2016	547,129		$	96.38
Exercised	(6,688	)	$	99.15
Outstanding at December 31, 2017	540,441		$	96.35
Exercised	—		$	—
Outstanding at December 31, 2018	540,441		$	96.35
Exercised	(145,088	)	$	96.27
Outstanding at December 31, 2019	395,353		$	96.37

Schedule of Stock Options Outstanding [Table Text Block]

The following table summarizes information about Boston Properties, Inc.’s stock options outstanding at December 31, 2019: 

Options Outstanding				Options Exercisable
Number Outstanding at 12/31/19	Weighted-Average Remaining Contractual Life	Exercise Price		Number Exercisable at 12/31/19	Exercise Price
81,458	1.1 years	$	86.86	81,458	$	86.86
54,282	3.3 years	$	95.69	54,282	$	95.69
142,422	3.1 years	$	98.46	142,422	$	98.46
117,191	2.1 years	$	100.77	117,191	$	100.77